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/*
* Copyright (C) 2003-2014 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "Set.hxx"
#include "TagBuilder.hxx"
#include <assert.h>
/**
* Copy all tag items of the specified type.
*/
static bool
CopyTagItem(TagBuilder &dest, TagType dest_type,
const Tag &src, TagType src_type)
{
bool found = false;
const unsigned n = src.num_items;
for (unsigned i = 0; i < n; ++i) {
if (src.items[i]->type == src_type) {
dest.AddItem(dest_type, src.items[i]->value);
found = true;
}
}
return found;
}
/**
* Copy all tag items of the specified type. Fall back to "Artist" if
* there is no "AlbumArtist".
*/
static void
CopyTagItem(TagBuilder &dest, const Tag &src, TagType type)
{
if (!CopyTagItem(dest, type, src, type) &&
type == TAG_ALBUM_ARTIST)
CopyTagItem(dest, type, src, TAG_ARTIST);
}
/**
* Copy all tag items of the types in the mask.
*/
static void
CopyTagMask(TagBuilder &dest, const Tag &src, uint32_t mask)
{
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if ((mask & (1u << i)) != 0)
CopyTagItem(dest, src, TagType(i));
}
void
TagSet::InsertUnique(const Tag &src, TagType type, const char *value,
uint32_t group_mask)
{
TagBuilder builder;
if (value == nullptr)
builder.AddEmptyItem(type);
else
builder.AddItem(type, value);
CopyTagMask(builder, src, group_mask);
#if defined(__clang__) || GCC_CHECK_VERSION(4,8)
emplace(builder.Commit());
#else
insert(builder.Commit());
#endif
}
bool
TagSet::CheckUnique(TagType dest_type,
const Tag &tag, TagType src_type,
uint32_t group_mask)
{
bool found = false;
for (unsigned i = 0; i < tag.num_items; ++i) {
if (tag.items[i]->type == src_type) {
InsertUnique(tag, dest_type,
tag.items[i]->value,
group_mask);
found = true;
}
}
return found;
}
void
TagSet::InsertUnique(const Tag &tag,
TagType type, uint32_t group_mask)
{
static_assert(sizeof(group_mask) * 8 >= TAG_NUM_OF_ITEM_TYPES,
"Mask is too small");
assert((group_mask & (1u << unsigned(type))) == 0);
if (!CheckUnique(type, tag, type, group_mask) &&
(type != TAG_ALBUM_ARTIST ||
/* fall back to "Artist" if no "AlbumArtist" was found */
!CheckUnique(type, tag, TAG_ARTIST, group_mask)))
InsertUnique(tag, type, nullptr, group_mask);
}
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